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Eric BThe album you reference mixes up the cards in all 3 series. Your best checklist comes directly from the backs or the cards.
The first series, N9, starts with 48 cards as per the checklist. There are also 2 others, Corea (rare) and Roumania (very rare) that seem to have been printed at the end of the cards cycle. Those 2 cards have checklists that include all 50. I don't know if there are 50-card checklists with the other 48 fronts out there.
Then there are "fancy" versions of 5 others (Austria, France, Holland, Italy, and Japan) which are not very hard to find.
Finally, there is a Belgium fancy card which shows a cigarette pack instead of a flag and the Great Britain yellow sun originally mentioned.
The rarest 4, in order, are Roumania, GB Yellow Sun, Belgium Fancy, and Corea. I will see if I can upload a scan of the first 2.